title: Efficient multi-keV x-ray generation from a high-Z target irradiated with a clean ultra-short laser pulse.
abstract: Kα line emissions from Mo and Ag plates were experimentally studied using clean, ultrahigh-intensity femtosecond laser pulses. The absolute yields of Kα x-rays at 17 keV from Mo and 22 keV from Ag were measured as a function of the laser pulse contrast ratio and irradiation intensity. Significantly enhanced Kα yields were obtained for both Mo and Ag by employing high contrast ratios and irradiances. Conversion efficiencies of 4.28×10⁻⁵/sr for Mo and 4.84×10⁻⁵/sr for Ag, the highest values obtained to date, were demonstrated with contrast ratios in the range 10⁻¹⁰ to 10⁻¹¹.
authors.affiliation: Institute of Laser Engineering, Osaka University, Osaka, Japan. zhang-z@ile.osaka-u.ac.jp
authors.forename: Z
authors.initials: Z
authors.lastname: Zhang
authors.forename: M
authors.initials: M
authors.lastname: Nishikino
authors.forename: H
authors.initials: H
authors.lastname: Nishimura
authors.forename: T
authors.initials: T
authors.lastname: Kawachi
authors.forename: A S
authors.initials: AS
authors.lastname: Pirozhkov
authors.forename: A
authors.initials: A
authors.lastname: Sagisaka
authors.forename: S
authors.initials: S
authors.lastname: Orimo
authors.forename: K
authors.initials: K
authors.lastname: Ogura
authors.forename: A
authors.initials: A
authors.lastname: Yogo
authors.forename: Y
authors.initials: Y
authors.lastname: Okano
authors.forename: S
authors.initials: S
authors.lastname: Ohshima
authors.forename: S
authors.initials: S
authors.lastname: Fujioka
authors.forename: H
authors.initials: H
authors.lastname: Kiriyama
authors.forename: K
authors.initials: K
authors.lastname: Kondo
authors.forename: T
authors.initials: T
authors.lastname: Shimomura
authors.forename: S
authors.initials: S
authors.lastname: Kanazawa
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D011829:Radiation Dosage; D014965:X-Rays